I have a Dell Dimension 8200 P4, 2.4ghz, 1gb ram with a 40gb hard drive. I am looking to replace the hard drive and wanted to know if it is best to get a hard drive with 8 or 16 MB Cache? I do a lot of graphic work and also use a lot of music files. Suggestions? Dell is recommending a 160GB/8MB Cache Maxtor HD.